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3 years ago

What's Alpha beta gamma emission??

1 answer:

5 0

Alpha radiation is the name for the emission of an alpha particle in fact an helium nuclei, beta radiation is the emission of electrons or positrons , and gamma radiation is the term used for the emission of energetic photons.

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A flea jumps straight up to a maximum height of 0.490 m . What is its initial velocity v0 as it leaves the ground?

zzz [600]

Answer:

$\huge\boxed{\sf v_o=3.1\ m/s}$

Explanation:

Given Data:

Acceleration due to gravity = g = -9.8 m/s²

Maximum Height = h = 0.490 m

At h, $v_f$ = 0

Required:

$v_o=?$

Formula:

$2gh=v_f^2-v_o^2$

Solution:

Put the givens

$2 (-9.8) (0.490) = (0)\² - v_o^2\\\\-9.604=-v_o^2\\\\9.604=v_o^2\\\\Take \ sqrt\ on \ both \ sides\\\\\sqrt{9.604}=v_o^2\\\\3.1 \ m/s=v_o\\\\v_o=3.1\ m/s\\\\\rule[225]{225}{2}$

3 0

2 years ago

Rita jeptoo of kenya was the first female finisher in the 110th boston marathon. she ran the first 10.0 km in a time of 0.5689 h

stira [4]

Part a

Answer: 17.58 km/h

$Average speed=\frac{Total\hspace{1mm}Distance}{Total\hspace{1mm}Time}$

Total Distance =10 km

Total time =0.5689 h

$\Rightarrow Average speed=\frac{10\hspace{1mm}km}{0.5689\hspace{1mm}h}=17.6 \hspace{1mm}km/h$

Part b

Answer: 17.626 km/h

$Average speed=\frac{Total\hspace{1mm}Distance}{Total\hspace{1mm}Time}$

Total Distance =42.195 km

Total time =2.3939 h

$\Rightarrow Average speed=\frac{42.195\hspace{1mm}km}{2.3939\hspace{1mm}h}=17.626\hspace{1mm}km/h$

8 0

3 years ago

Can you help and explain these for me?

ollegr [7]

Yes I can do you want me to

8 0

3 years ago

An object is thrown horizontally from the open window of a building. If the initial speed of the object is 20 m/s and it hits th

klemol [59]

An object is thrown horizontally from the open
window of a building. If the initial speed of the
object is 20 m/s and it hits the ground 2.0 s later,
from what height was it thrown? (Neglect air
resistance and assume the ground is level.)
Initial vertical velocity = 0
formula: s = ut + (1/2)*g*t^2
s = 0 + 1/2*9.8*2^2
s = 9.8*2 = 19.6 m

8 0

3 years ago

Describe one piece of evidence to show light waves do not need a medium travel from one place to another

Art [367]

Answer:

I don't know I'm sorry I will tell you another answer asks me

5 0

3 years ago